class TGedEditor: public TVirtualPadEditor, public TGMainFrame

TGedEditor

The main class of ROOT graphics editor. It manages the appearance
of objects editors according to the selected object in the canvas
(an object became selected after the user click on it using the
left-mouse button).

Every object editor provides an object specific GUI and follows a
simple naming convention: it has as a name the object class name
concatinated with 'Editor' (e.g. for TGraph objects the object
editor is TGraphEditor).

The ROOT graphics editor can be activated by selecting 'Editor'
from the View canvas menu, or SetLine/Fill/Text/MarkerAttributes
from the context menu. The algorithm in use is simple: according to
the selected object <obj> in the canvas it looks for a class name
<obj>Editor. If a class with this name exists, the editor verifies
that this class derives from the base editor class TGedFrame.
It makes an instance of the object editor, scans all object base
classes searching the corresponding object editors and makes an
instance of the base class editor too. Once the object editor is in
place, it sets the user interface elements according to the object
state and is ready for interactions. When a new object of a
different class is selected, a new object editor is loaded in the
editor frame. The old one is cached in memory for potential reuse.

Any created canvas will be shown with the editor if you have a
.rootrc file in your working directory containing the the line:
Canvas.ShowEditor:      true

An created object can be set as selected in a macro by:
canvas->Selected(parent_pad_of_object, object, 1);
The first parameter can be the canvas itself or the pad containing
'object'.

// /* */